Function and use: As a speed regulating resistor accessory, it can adjust the speed of the blower and heater fan, control the air volume and temperature, and play a key role. Applicable models: Adapt to corresponding models such as 27761-4BA0A, which can accurately match related equipment to ensure normal function after installation. Replacement advantage: When the original resistor fails, it can be used as a replacement part, which is convenient for replacement and can quickly restore the normal operation of the equipment. Working principle: By changing the resistance size to control the current, the fan speed, warm air and other conditions can be adjusted. The principle is easy to understand. Application scenario: Commonly used in scenes with warm air and blower equipment such as cars to ensure that the air outlet can be adjusted as needed in the car to create a comfortable environment.